mirror of
https://github.com/astaxie/beego.git
synced 2024-12-23 06:50:50 +00:00
247 lines
4.8 KiB
Go
247 lines
4.8 KiB
Go
package logs
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import (
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"encoding/json"
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"errors"
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"fmt"
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"io/ioutil"
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"log"
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"os"
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"path"
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"path/filepath"
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"strings"
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"sync"
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"time"
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)
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type FileLogWriter struct {
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*log.Logger
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mw *MuxWriter
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// The opened file
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filename string
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maxlines int
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maxlines_curlines int
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// Rotate at size
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maxsize int
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maxsize_cursize int
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// Rotate daily
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daily bool
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maxdays int64
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daily_opendate int
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rotate bool
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startLock sync.Mutex // Only one log can write to the file
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level int
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}
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type MuxWriter struct {
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sync.Mutex
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fd *os.File
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}
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func (l *MuxWriter) Write(b []byte) (int, error) {
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l.Lock()
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defer l.Unlock()
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return l.fd.Write(b)
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}
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func (l *MuxWriter) SetFd(fd *os.File) {
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if l.fd != nil {
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l.fd.Close()
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}
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l.fd = fd
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}
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func NewFileWriter() LoggerInterface {
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w := &FileLogWriter{
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filename: "",
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maxlines: 1000000,
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maxsize: 1 << 28, //256 MB
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daily: true,
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maxdays: 7,
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rotate: true,
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level: LevelTrace,
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}
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// use MuxWriter instead direct use os.File for lock write when rotate
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w.mw = new(MuxWriter)
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// set MuxWriter as Logger's io.Writer
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w.Logger = log.New(w.mw, "", log.Ldate|log.Ltime)
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return w
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}
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// jsonconfig like this
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//{
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// "filename":"logs/beego.log",
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// "maxlines":10000,
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// "maxsize":1<<30,
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// "daily":true,
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// "maxdays":15,
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// "rotate":true
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//}
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func (w *FileLogWriter) Init(jsonconfig string) error {
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var m map[string]interface{}
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err := json.Unmarshal([]byte(jsonconfig), &m)
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if err != nil {
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return err
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}
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if fn, ok := m["filename"]; !ok {
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return errors.New("jsonconfig must have filename")
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} else {
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w.filename = fn.(string)
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}
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if ml, ok := m["maxlines"]; ok {
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w.maxlines = int(ml.(float64))
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}
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if ms, ok := m["maxsize"]; ok {
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w.maxsize = int(ms.(float64))
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}
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if dl, ok := m["daily"]; ok {
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w.daily = dl.(bool)
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}
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if md, ok := m["maxdays"]; ok {
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w.maxdays = int64(md.(float64))
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}
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if rt, ok := m["rotate"]; ok {
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w.rotate = rt.(bool)
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}
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if lv, ok := m["level"]; ok {
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w.level = int(lv.(float64))
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}
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err = w.StartLogger()
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return err
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}
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func (w *FileLogWriter) StartLogger() error {
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fd, err := w.createLogFile()
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if err != nil {
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return err
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}
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w.mw.SetFd(fd)
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err = w.initFd()
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if err != nil {
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return err
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}
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return nil
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}
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func (w *FileLogWriter) docheck(size int) {
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w.startLock.Lock()
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defer w.startLock.Unlock()
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if (w.maxlines > 0 && w.maxlines_curlines >= w.maxlines) ||
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(w.maxsize > 0 && w.maxsize_cursize >= w.maxsize) ||
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(w.daily && time.Now().Day() != w.daily_opendate) {
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if err := w.DoRotate(); err != nil {
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fmt.Fprintf(os.Stderr, "FileLogWriter(%q): %s\n", w.filename, err)
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return
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}
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}
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w.maxlines_curlines++
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w.maxsize_cursize += size
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}
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func (w *FileLogWriter) WriteMsg(msg string, level int) error {
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if level < w.level {
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return nil
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}
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n := 24 + len(msg) // 24 stand for the length "2013/06/23 21:00:22 [T] "
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w.docheck(n)
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w.Logger.Println(msg)
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return nil
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}
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func (w *FileLogWriter) createLogFile() (*os.File, error) {
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// Open the log file
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fd, err := os.OpenFile(w.filename, os.O_WRONLY|os.O_APPEND|os.O_CREATE, 0660)
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return fd, err
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}
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func (w *FileLogWriter) initFd() error {
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fd := w.mw.fd
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finfo, err := fd.Stat()
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if err != nil {
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return fmt.Errorf("get stat err: %s\n", err)
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}
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w.maxsize_cursize = int(finfo.Size())
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w.daily_opendate = time.Now().Day()
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if finfo.Size() > 0 {
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content, err := ioutil.ReadFile(w.filename)
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if err != nil {
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return err
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}
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w.maxlines_curlines = len(strings.Split(string(content), "\n"))
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} else {
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w.maxlines_curlines = 0
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}
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return nil
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}
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func (w *FileLogWriter) DoRotate() error {
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_, err := os.Lstat(w.filename)
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if err == nil { // file exists
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// Find the next available number
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num := 1
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fname := ""
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for ; err == nil && num <= 999; num++ {
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fname = w.filename + fmt.Sprintf(".%s.%03d", time.Now().Format("2006-01-02"), num)
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_, err = os.Lstat(fname)
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}
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// return error if the last file checked still existed
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if err == nil {
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return fmt.Errorf("Rotate: Cannot find free log number to rename %s\n", w.filename)
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}
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// block Logger's io.Writer
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w.mw.Lock()
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defer w.mw.Unlock()
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fd := w.mw.fd
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fd.Close()
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// close fd before rename
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// Rename the file to its newfound home
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err = os.Rename(w.filename, fname)
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if err != nil {
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return fmt.Errorf("Rotate: %s\n", err)
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}
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// re-start logger
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err = w.StartLogger()
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if err != nil {
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return fmt.Errorf("Rotate StartLogger: %s\n", err)
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}
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go w.deleteOldLog()
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}
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return nil
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}
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func (w *FileLogWriter) deleteOldLog() {
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dir := path.Dir(w.filename)
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filepath.Walk(dir, func(path string, info os.FileInfo, err error) error {
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if !info.IsDir() && info.ModTime().Unix() < (time.Now().Unix()-60*60*24*w.maxdays) {
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if strings.HasPrefix(filepath.Base(path), filepath.Base(w.filename)) {
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os.Remove(path)
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}
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}
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return nil
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})
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}
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func (w *FileLogWriter) Destroy() {
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w.mw.fd.Close()
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}
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func (w *FileLogWriter) Flush() {
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w.mw.fd.Sync()
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}
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func init() {
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Register("file", NewFileWriter)
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}
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